Developers like to get together over weekends to build new products from scratch. These are called 'hackathons'. By embedding them in local surroundings and getting support from local governments, they will be easier to exist and grow.
Hackathons (this has no relationship to the illegal connotation of the word 'hacker') and user groups are where ideas are created. People, often still without goal or purpose, get together to experiment.
Yet, user groups are scarce, and hackathons even more so. That is because in Europe they are often much harder to organize than in the US. Public buildings like libraries, schools, universities, ... are not widely accessible (opening hours, security), whereas the commercial market asks huge sums for simple short location rental services in cities like Brussels and Amsterdam.
Even though requirements for a good organisation are not overly complicated (good WiFi, a beamer, tables and chairs, possibility of self-catering), the infrastructure often is just not good enough.
By leveraging existing public domain and the policy for regular local community life (carnaval, youth orgs) and local government support, a lot more should be possible. However, there is a bridge to cross here, as locals often do not understand the intent, do not recognize the value for the community, or fail to keep things lightweight. Some top-down awareness injection could certainly help there.